Foot warmer



FIG. 1 is an isometric view of a foot warmer, showing my new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a back elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof;

The broken lines in the drawings are for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a foot warmer, as shown and described. 